The process of passing water through a bed of zeolite removes:
A. Dissolved gases
B. Hardness
C. Bacteria
D. Suspended impurities
Answer: Option B
Solution (By JKSSB Mock Tests)
The zeolite (permutit) process is used to remove water hardness. Zeolite (hydrated sodium aluminum silicate) exchanges its Na⁺ ions for the Ca²⁺ and Mg²⁺ ions in hard water, thus softening it. It does not remove bacteria, dissolved gases, or suspended solids.
Explanation:
The atomic number (Z) equals the number of protons, which is 17. The mass number (A) is the sum of protons and neutrons. Therefore, the number of neutrons = A - Z = 35 - 17 = 18. This atom is Chlorine-35, a stable isotope of chlorine.
Explanation:
Water hardness is classified into temporary and permanent. Temporary hardness is caused by the dissolved bicarbonates of calcium and magnesium (Ca(HCO3)2 and Mg(HCO3)2). It is called 'temporary' because it can be easily removed by simple boiling, which decomposes the soluble bicarbonates into insoluble carbonates.
Explanation:
A disproportionation reaction is a specific type of redox reaction where the same element in a single substance is simultaneously oxidized and reduced. In the decomposition of hydrogen peroxide (H2O2), oxygen has an oxidation state of -1. It is reduced to -2 in H2O and oxidized to 0 in O2.
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